Suzalkem Technologies PHP Developer Interview Questions and Answers

include() includes a file multiple times while include_once() includes it only once.

• include() can include the same file multiple times, causing errors

• include_once() checks if the file has already been included and skips it if so

• include() is faster than include_once() but can cause issues with redeclaring functions or classes

The default join in MySQL is INNER JOIN.

• INNER JOIN is the most commonly used join in MySQL.

• It returns only the matching rows from both tables.

• Other types of joins include LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN.

Char is a fixed-length data type while varchar is a variable-length data type.

• Char is used for storing fixed-length strings while varchar is used for storing variable-length strings.

• Char takes up more space than varchar as it reserves space for the maximum length of the string.

• Varchar is more flexible than char as it can store strings of varying lengths.

• Char is faster than varchar for fixed-length strings as it does no